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computer vulnerability bulletin CVE-2016-0742 CVE-2016-0746 CVE-2016-0747

nginx: three vulnerabilities of the DNS client

Synthesis of the vulnerability

An attacker who controls a DNS server can use several vulnerabilities of nginx.
Vulnerable products: Debian, Fedora, nginx, openSUSE Leap, RHEL, Ubuntu.
Severity of this weakness: 2/4.
Consequences of an attack: privileged access/rights, denial of service on service.
Hacker's origin: internet server.
Number of vulnerabilities in this bulletin: 3.
Creation date: 27/01/2016.
Références of this bulletin: CERTFR-2016-AVI-039, CVE-2016-0742, CVE-2016-0746, CVE-2016-0747, DSA-3473-1, FEDORA-2016-bf03932bb3, FEDORA-2016-fd3428577d, openSUSE-SU-2016:0371-1, RHSA-2016:1425-01, USN-2892-1, VIGILANCE-VUL-18828.

Description of the vulnerability

Several vulnerabilities were announced in nginx.

An attacker can send a malicious packet, in order to make the server access an invalid memory address and so trigger a denial of service. [severity:2/4; CVE-2016-0742]

An attacker can force the usage of a freed memory area in the processing of response record of type CNAME, in order to trigger a denial of service, and possibly to run code. [severity:2/4; CVE-2016-0746]

An attacker can trigger an excessive resource use with responses of type CNAME, in order to trigger a denial of service. [severity:2/4; CVE-2016-0747]
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